1 Corinthians 1:18, 23-24
1 Corinthians 1:18 ASV
For the word of the cross is to them that perish foolishness; but unto us who are saved it is the power of God.
1 Corinthians 1:23-24 ASV
but we preach Christ crucified, unto Jews a stumblingblock, and unto Gentiles foolishness; but unto them that are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.